Backend Service returns 503 error after completing data transfer

[Its-suLav-D]

Hey there, when I request data transfer it gets into a completed state, but I get a 503 error from my backend service. I am not sure why it is behaving like this. Here is the response from data transfer request

{
    "createdAt": 1668544836320,
    "updatedAt": 1668544846120,
    "id": "35a6254a-3e06-421d-9da3-d6d4c1be46bb",
    "type": "CONSUMER",
    "state": "COMPLETED",
    "stateTimestamp": 1668544846120,
    "errorDetail": null,
    "dataRequest": {
        "assetId": "urn:uuid:a244b885-7997-4c10-8d74-8bba3afbb2d1-urn:uuid:370b193a-22db-45fa-8ec3-c596990ab4f1",
        "contractId": "6532d666-698f-4729-a52b-225d6f120f84:c3b85c77-7d30-4b06-9cf3-4ab95ffacfb1",
        "connectorId": "consumer-102"
    },
    "dataDestination": {
        "properties": {
            "type": "HttpProxy"
        }
    }
}

This is the log that I got from my Backend Service. Although I get 503 the backend service attempts to write the data chunk

Writing data chunk (53b) from https://consumer-plane-transfer.com/api/public/ to /mnt/data/af8b4c1a-bd51-48c0-b8fa-0711bc5ec5b9\"}"
--

log | "{\"level\":\"info\",\"message\":\"POST / 503 76ms\",\"meta\":{\"req\":{\"headers\":{\"accept-encoding\":\"gzip\",\"connection\":\"Keep-Alive\",\"content-length\":\"3036\",\"content-type\":\"application/json; charset=utf-8\",\"host\":\"edc-backend-application\",\"user-agent\":\"okhttp/4.9.3\"},\"httpVersion\":\"1.1\",\"method\":\"POST\",\"originalUrl\":\"/\",\"query\":{},\"url\":\"/\"},\"res\":{\"statusCode\":503},\"responseTime\":76}}"
-- | --
  |   | message | "POST / 503 76ms"
  |   | meta | {"req":{"headers":{"accept-encoding":"gzip","connection":"Keep-Alive","content-length":"3036","content-type":"application/json; charset=utf-8","host":"edc-backend-application","user-agent":"okhttp/4.9.3"},"httpVersion":"1.1","method":"POST","originalUrl":"/","query":{},"url":"/"},"res":{"statusCode":503},"responseTime":76}

and this is the log response that I get from the control-plane

2022-11-16T19:17:51.455391234Z stderr F org.eclipse.dataspaceconnector.spi.EdcException: Received error code 503 when transferring endpoint data reference at uri: http://edc-backend-application

I am not sure what is the root issue here. I appreciate you guys guiding me in right direction. Thanks a bunch.

[Its-suLav-D]

@denisneuling Wondering if you could give any guidance on the issue. Thanks a lot